EDT:Packaging and Builds

Eclipsey release stuff

We're not sure exactly what this is going to take. Set aside 5 days for various tasks ("paperwork", web site updates, different build process, etc.).

Split EDT into two programs

The idea is to split EDT into "Core" and "Extended" (we'll choose different names). Core EDT includes everything necessary to make a particular implementation of EGL: the full IDE, compiler, etc. but no generators, runtimes, or tooling which depends on a particular implementation. Extended EDT is Core EDT plus generators, runtimes, etc.